3GPP 21.900 v20.0.0 — the document's own text
7.2 Work Item Status List
Taught in 15. Reading either body's paper trail from a cold start (How standards actually get made, in depth).
This data base contains information about all 3GPP Work Items, in terms of identified future specifications, identified specifications to be amended, supplementary/temporary documentation, expected/planned completion dates and intermediary milestones, and other management information related to specifications, responsible Groups, rapporteurs, completion dates etc.